NSi6801
NSi6801 is a single-channel isolated gate driver with 5A peak output current, 5kVrms isolation, and 60ns propagation delay for high-frequency switching applications.
Product Overview
Description
The NSi6801 is a high-performance single-channel isolated gate driver designed for high-frequency power switching applications. With 5A peak output current and 60ns propagation delay, it delivers fast, efficient switching for MOSFETs and IGBTs.
Featuring 5kVrms reinforced isolation and >150kV/us CMTI, the NSi6801 ensures reliable operation in noisy industrial environments. The wide operating temperature range of -40°C to +125°C makes it suitable for demanding applications.
The NSi6801 includes comprehensive protection features such as UVLO, active Miller clamp, and thermal shutdown. These features protect the power switch and improve system reliability in motor drives, power supplies, and inverters.
Product Series
NSi
Primary Application
High-frequency DC-DC converters
Key Features
- 5A peak output current for fast switching
- 60ns propagation delay with tight tolerance
- 5kVrms reinforced isolation rating
- >150kV/us CMTI for high noise immunity
- Active Miller clamp prevents false turn-on
- UVLO protection with hysteresis
- Thermal shutdown protection
- Wide operating temperature range
Specifications
| Peak Output Current | 5A source/sink |
|---|---|
| Isolation Voltage | 5kVrms (reinforced) |
| Working Voltage | 1.5kVrms |
| CMTI | >150kV/us |
| Propagation Delay | 60ns typical |
| Rise/Fall Time | 15ns/12ns |
| UVLO Threshold | 8V/7V (VDD) |
| Operating Temperature | -40°C to +125°C |
| Package | SOIC-8 |
| Certification | UL1577, IEC 60747-5-5 |
| Voltage Rating | 5kVrms |
| Current Rating | 5A |
| Temperature Range | -40°C to +125°C |
Applications
High-frequency DC-DC converters
Power conversion and supply
Motor drive inverters
Motor drive and control systems
Switched-mode power supplies
Electronic system design
Induction heating systems
Electronic system design
Welding equipment
Electronic system design
UPS systems
Electronic system design
FAE Expert Insights
"The NSi6801 is my go-to recommendation for high-frequency switching applications requiring single-channel isolation. The 5A drive capability handles most MOSFETs and IGBTs up to 100A, while the 60ns propagation delay enables precise timing control. The active Miller clamp is essential for half-bridge configurations to prevent shoot-through. I've successfully used this driver in 100kHz+ resonant converters where fast switching is critical. The 5kVrms isolation provides excellent safety margins for industrial equipment. For designs requiring dual channels, consider the NSi6602, but for single-channel needs, the NSi6801 offers optimal performance and cost."
Excellent performance for high-frequency switching with robust protection
— Senior Gate Driver FAE, BeiLuo
Frequently Asked Questions
What is the maximum switching frequency for NSi6801?
The NSi6801 supports switching frequencies up to 2MHz, making it suitable for high-frequency resonant converters and DC-DC converters. At 200kHz switching with 50nC gate charge, the average gate drive power is approximately 0.5W. The 60ns propagation delay is only 12% of the switching period at 200kHz, enabling precise timing control. For very high frequency applications above 500kHz, ensure adequate thermal management and verify that the total propagation delay meets your timing budget requirements.
For applications up to 500kHz, NSi6801 is ideal. For MHz-range switching, verify thermal design and timing requirements.
How does the active Miller clamp work in NSi6801?
The active Miller clamp in NSi6801 prevents false turn-on caused by Miller capacitance coupling during high dv/dt switching. When the driver output is low (switch off), the Miller clamp provides a low-impedance path from the gate to ground. If dv/dt on the drain causes current to flow through the Miller capacitance (Cgd), the Miller clamp sinks this current, preventing the gate voltage from rising above the threshold. The clamp activates at approximately 2V gate voltage, providing protection before the device can turn on. This is essential for half-bridge and full-bridge configurations where shoot-through would cause catastrophic failure.
Always use the Miller clamp feature in half-bridge and full-bridge applications. Connect the CLAMP pin to the gate for optimal performance.